. The practical telephone handbook and guide to the telephonic exchange . gnets are actuated;the 3 vertical shafts or rods of the selectors and connectorare revolved back by spiral springs, and then fall vertically totheir normal positions. The connection of a subscribers set was given in Fig. 471-,the telephone lever being there represented in its normalposition with the receiver on the prong. It will be observedthat the transmitter is worked with a local battery, and thisis one of the drawbacks of this automatic system, as was not then feasible. An even more serious defect is tha
. The practical telephone handbook and guide to the telephonic exchange . gnets are actuated;the 3 vertical shafts or rods of the selectors and connectorare revolved back by spiral springs, and then fall vertically totheir normal positions. The connection of a subscribers set was given in Fig. 471-,the telephone lever being there represented in its normalposition with the receiver on the prong. It will be observedthat the transmitter is worked with a local battery, and thisis one of the drawbacks of this automatic system, as was not then feasible. An even more serious defect is that the speaking circuit ofthe lines is rendered very poor by the inclusion of severalrelay magnets and wiper and switch contacts directly in themain lines. This is shown in Fig. 477, which shows the mainline connections when subscriber No. 2222 is speaking throughto No. 5679, as detailed above. It will be observed that there A UTOMA TIC EXCHA NGES 519 are not less than 6 relay magnets and 12 break contactsin the main line circuit, apart from the sub-station connections,. 5 o i
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
